Drafting triangle



March 30 1926.

J. S. PECKER DRAFTING TRIANGLE Filed March 5, 1924 C 57 $86.77 11021.0! M2 L2 I. L58 2.04

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Patented Mar. 30, 1926.

JOSEPH S. PEGKER, OF PHILADELPHIA, PENNSYLVANIA.

DBAFTING TRIANGLE.

Application filed March 5, 1924. Serial No. 697,008.

To all whom it may concern:

Be it known that I, J OSEPH S. PEGKER, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented new and useful Improvements in Drafting Triangles, of which the following is a spec-i" fication.

The invention relates to an improved drafting device designed to be applied to and embodied in a triangle, T-square, protractor or other instrument or other available surface.

As the mostcommon thing to draw in laying out any machine or analogous mechanism 1s screws, 1t becomes quite a problem to determine the size of the head of a screw and to determine also whether there is suflicient clearance between screws and surrounding :parts in the drawing of screws having hexagonal heads. Very often the size of the screw is not so important as the size of the head. Also the drawing of conventional screw threads is also-necessary.

Furthermore, it is also desirable at times to draw two lines at-right angles to each other. -When a line is not parallel to the T-square, it is necessary to use' two triangles in the :conventional way, a-ndit isparticularly difiicult under. such circumstances to draw a line at right angles to another line a point on 30 triangle and a triangle, but sixteen divisionsv can be made only with the use of a protractor. V

It is the object of the resent invention to provide a drafting device capable of en'a- "bling the foregoing functions and other measurements to be readily performed from which it is possible for .a designer to select a screw the head of which will not interfere with surroundin objects. The device is also adapted to ave its diagrams, scales and graduations stamped, etched or otherwise applied to various draftsmans instru-" ments and other available surfaces to enhance the value of instruments and for advertising and other purposes.

With these and other objects in view, the invention consists in the construction and novel combination and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings and pointed out 1n the claims hereto appended it being undcrstood that various changes in the form,'proportions and minor details of construction, within the scope of the claims, may be resorted to without departing from the spiritor sacrificing any of the advantages of the invention.

In the drawin s, inwhich like characters of reference deslgnate corresponding parts in the several views:

Fig. 1 is a sideelevation of a full sized triangle embodying the improvements of the present'invention.

Figs. 2 to 6 inclusive, are plan views of the same on a reduced scale illustrating some of the var oususes of the triangle and the matter appearing on the triangle in Figure 1 being omitted'for convenience of illustration.

In the accompanying drawings in-which 1s illustrated the preferred embodiment of the invention, a conventional 30 triangle 1 containing the various improvements is illustrated in Fig. 1. The triangle 1 which is preferably constructed of transparent material may of course, be made of any other suitable material such as wood or metal and it is equipped with a series of hexagonal screw head openings 2, 3, 4, 5 and 6,

which may be conveniently arranged along and adjacent the vertical edge as shown in Fig. 1. The hexagonal openings 2 to 6 inclusive, have angles 8, arranged at the top and bottom of the openings in vertical alignment with the centers of the same. The said openings are also provided at opposite vertical sides with notches 8*, which are angular and present V edges arranged in line with the horizontal diameters of the openings. The angles at the top and bottom of the hexagonal screwhead openings and the notches at opposite vertical sides there of will serve as means for enabling the hexagonal openings to be lined up oma drawing board on either'a vertical or horizontal center with absolute accuracy.

Associated with the hexagonal screw head openings "are arc'uate slots 26, which may be of any desired degree and which indicate the clearance required for an open end or socket wrench so that the screws may be arranged so that adjacent parts of a machine will not interfere with the use of such a wrench. 7

Views or diagrams 9 and 10 of a flat head screw or a filistcr screw head are preferably provided and arranged as illustrated iii-Figure 1 of the drawing. The triangle is alsopreferably provided with a table 11, arranged across the base portions of the triangle and adapted to give the sizes of screw heads. This table of data from which dimensions of various parts of screws and screw heads can be selected, is designed to be extended for all sizes beyond the range of the hexagonal screw head openings of the drawing, and it will be apparent that instead of locating the data table at the base of'the triangle, it may be disposed at any other convenient point.

The triangle is provided with a central opening 12 having one side edge corresponding with the hypothenuse of the triangle and two broken edges corresponding .in general direction to the vertical edge of the triangle. The opening is provided at the larger end thereof with a plurality of angularly relating edges connecting the said side edges. The edges 13 and 14 at one side of the tapering openin 12 are adapted for drawing conventional right and left hand screw threads as illustrated in Fig. 4 of the drawing. The drawing of these conventional screw threads becomes a simple process as the triangle can be held against a T-square and shifted in a horizontal position in drawing the screw threads. At the larger end of the opening 12 are the edges 15, 16 and 17, which are adapted for the drafting of hexagonal screw heads, as illustrated in Figs. 2 and 3 of the drawings. The edge 18 of the opening 12 is in parallelism with the hypothenuse edge 19 of the triangle and at right angles to a graduated line 20 extending from the hypothenuse edge 19 to the vertical edge 20 of the triangle.

The line 20 is in alignment with the edge 17 of the opening 12 and extends from the same in opposite directions and an opening 20 is provided on the'line 20 at a point between the opening 12 and the vertical edge 20 of the triangle to assist in truing the triangle and in properly positioning the triangle.

The triangle is provided with lines 21 and 22 radiating from a point 23 on the hypothenuse edge 19 of the triangle and adapted to enable circles to be divided as illustrated in Fig. 5 of the drawing. The radial lines 22 extend to the opening 12 and at the outer ends of the radial lines 21, which do not extend to the opening 12, are provided holes 24 for enabling the radial point or division point to be marked on paper with a. pencil or instrument. The radial lines 22 terminating at the opening 12, may be marked at the opening as will be readily understood. These features make it possible to lay out work witn the use of one triangle where a scale and two triangles were necessary before. Lines may be drawn at right angles to other lines, no matter what angular position the latter lines may have to the vertical and horizontal axis of the drawing board.

The radial lines can be" selected to give angles which are constantly used, but which cannot be readily obtained by the use of the standard 30, 45 and 60 degree triangle, for instance, radial lines which will'give division of 15 degrees, 22 degrees, 67 degrees, 75- degrees, etc.

Figure 1 illustrates a convenient lay-out on a conventional 30 triangle, but any other de ree trian le may be e ui )ed with these.

improvements. A lay-out of the radial lines 21 and 22, the screw heads, the table and the edges of the triangle at the opening 12 may be varied as will be readily understood. Also the dimensions of the screw heads may be varied to suit different requirements and while the dimensions are shown applied only to screws, they may of course, be employed for any similar fastening devices.

The triangle is provided at the hypothenuse edge with scales 25 extending to the right and left from the central point 25}. Also, the triangle is provided with arcs 26 associated with the diagrams of the hexagonal heads for indicating the necessary wrench clearance.

While I have illustrated my improvements as applied to a draftsmans triangle, they are not confined to a triangle but may he applied to T-squares, protractors, advertising devices and the like, which may be made of any suitable material such as wood, cclluloid, cardboard and the like, and may be opaque or transparent.

What is claimed isi 1. A device of the class described provided with a series of hexagonal openings having opposite angles located in vertical alignment with the center of the openings, said device being also provided at opposite vertical sides of the openings with notches located in horizontal alignment with the centers of the openings, said triangle being also provided with arcuate slots associated with the said openings and located at dilferent distances from the same to indicate limitations of interference of other parts of a machine so that a wrench or other tool may be used without interference on a screw head or nut.

2. A device of the class described pro- .vided with a series of hexagonal openings and having notches located at the middle points of opposite sides of the openings in line with the centers of the openings and at right angles to a line bisecting two of the opposite angles of the said openings whereby the openings are adapted to be laid out on a drawing board with aceu 'acy,said triangle being also provided with arcuate slots associated with the said openings and located at different distances from the same to indicate limitations ofinterference of other parts of a machine so that a wrench or other tool may be used without interference on a screw head or nut.

3. A device of the class described provided with a plurality ofscrew head openings and having areuate' slots associated with the screw head openings and arranged to indicate limitation of interference of other parts of a machine so that a wrench or other tool may be used without interference -on a screw head or nut.

4. A drafting triangle provided with an opening having an edge arranged at right angles to the hypothenuse edge of the triangle, said triangle being also provided with opening having an edge arranged at right angles to the hypothenuse edge of the triangle, said triangle being also provided with a graduated line in line with said edge extending beyond the said edge of the opening to the hypothenuse edge and to the vertical edge of the triangle, the hypothenuse edge of the triangle being graduated in opposite directions from the said graduated line.

6. A drafting triangle provided with an opening having an edge arranged at right 1 angles to the hypothe-nuse edge: of the triangle, said triangle being also provided with a graduated line in line with said edge extending beyond the said edge of the open ing to the hypothenuse edge and to the vertical edge ofthe triangle, the hypothenuseedge of the triangle being graduated in opposite directions from the said graduated line, and the triangle being provided with a slot or opening located at the graduated line at a point between the said opening and the vertical edge.

In testimony whereof I have hereunto set my hand.

JOSEPH S. PECKER. 

